4= Yon/四/とん (Shi/四/し is another word for four, but it is used less, because Shi also means death, which is written as 死 in Kanji)

5= Go/五/ご

6= Roku/六/ろく

7= Shichi/七/しち (Another word for seven is Nana/七/なな. I believe this is because, like the word for four, ‘shi’ is associated with the word ‘Shini/死に/しに’ meaning ‘death’)

8= Hachi/八/はち

9= Kyuu/九/きゅう （Nine can also be Ku/九/く, but this is also thought to be bad luck as Ku also means suffering 苦）

10= Ju/十/じゅ

Not too difficult, right? I actually found the Kanji for the numbers some of the easiest to learn. An easy way to revise them is to write the kanji when writing lists, in place of 1, 2, 3, 4, etc you can write 一、二、三、四、and so on. It’s a little more effort, but that practice will help you memorise the kanji!

That’s pretty much the hardest part of learning the numbers, as counting beyond ten is pretty simple.